Forest Green Tarp 4.5 OZ., 3'x18' Medium Duty: Tarp is 9-10 Mil thick, Fabric weighs 4.5 oz. per square yard UV Treated, Waterproof, Mildew, Acid and Tear Resistant Easy to Tie Down: Rustproof aluminum grommets approximately every 36 inches and at the Corners Seams and Hems are Heat Sealed. Hems are Reinforced with Poly Twine CUT SIZE: Tarp will measure 6 inches or 3-5% shorter than listed size